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Goodwill and intangible assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill Activity |
Goodwill |  |  |  |  |  |  |  |
Balance at December 31, 2018 |  | $ | 137,190 |  |  |  |  |  |  |
Addition from acquisition of Atlantic Capital branches |  | 31,961 |  |  |  |  |  |  |
Relief of goodwill due to sale of TPO mortgage delivery channel |  | (100) |  |  |  |  |  |  |
Balance at December 31, 2019 |  | $ | 169,051 |  |  |  |  |  |  |
Balance at December 31, 2019 |  | $ | 169,051 |  |  |  |  |  |  |
Addition from acquisition of Farmers National |  | 6,319 |  |  |  |  |  |  |
Addition from acquisition of Franklin |  | 67,191 |  |  |  |  |  |  |
Balance at December 31, 2020 |  | $ | 242,561 |  |  |  |  |  |  |
Schedule of Core Deposit and Other Intangibles | The composition of core deposit and other intangibles as of December 31, 2020 and December 31, 2019 is as follows:
|  | Core deposit and other intangibles |  |
|  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  |
December 31, 2020 |  |  |  |  |  |  |  |
Core deposit intangible |  | $ | 59,835 |  |  | $ | (38,807) |  |  | $ | 21,028 |  |  |
Customer base trust intangible |  | 1,600 |  |  | (547) |  |  | 1,053 |  |  |
Manufactured housing servicing intangible |  | 1,088 |  |  | (743) |  |  | 345 |  |  |
Total core deposit and other intangibles |  | $ | 62,523 |  |  | $ | (40,097) |  |  | $ | 22,426 |  |  |
December 31, 2019 |  |  |  |  |  |  |  |
Core deposit intangible |  | $ | 49,675 |  |  | $ | (33,861) |  |  | $ | 15,814 |  |  |
Customer base trust intangible |  | 1,600 |  |  | (387) |  |  | 1,213 |  |  |
Manufactured housing servicing intangible |  | 1,088 |  |  | (526) |  |  | 562 |  |  |
Total core deposit and other intangibles |  | $ | 52,363 |  |  | $ | (34,774) |  |  | $ | 17,589 |  |  |
Schedule of Estimated Aggregate Amortization Expense of Core Deposit and Other Intangibles | The estimated aggregate future amortization expense of core deposit and other intangibles is as follows:
2021 |  | $ | 5,477 |  |
2022 |  | 4,586 |  |
2023 |  | 3,658 |  |
2024 |  | 2,946 |  |
2025 |  | 2,306 |  |
Thereafter |  | 3,453 |  |
|  | $ | 22,426 |  |

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